Temperature sensitivity of soil microbial respiration in soils with lower substrate availability is enhanced more by labile carbon input

doi:10.1016/j.soilbio.2021.108148

	Temperature sensitivity of soil microbial respiration in soils with lower substrate availability is enhanced more by labile carbon input
	Liu, Yuan 1,2; Xu, Li 1; Zheng, Shuai 3,4; Chen, Zhi 1,2; Cao, Yingqiu 5; Wen, Xuefa 1,2; He, Nianpeng 1,2,3,4
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2021-03-01
卷号	154 页码:9
关键词	Temperature sensitivity Soil microbial respiration Substrate availability Substrate quality Glucose
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2021.108148
通讯作者	Xu, Li(xuli@igsnrr.ac.cn)
英文摘要	The temperature sensitivity (O-10) of soil microbial respiration (R-s) is a critical parameter for predicting soil carbon (C) fluxes under changing climatic conditions, and labile C is continuously input into soil via root exudates or plant litter in field. However, how Q(10) responds to labile C input remains uncertain, especially across large geographical regions. We collected eight soils from tropical to cold-temperate forests along a north-south transect in eastern China, and soils were added with either water as a control or glucose as an analogue for labile C input to investigate how Q(10) responds to labile C input at a large geographical scale. Then, soils were incubated under varying temperature conditions from 5 to 30 degrees C for 2-weeks, and R-s was measured at a high frequency (each sample was measured at 20 min intervals within 12 h) after 1 d, 7 d and 14 d incubation. R-s and Q(10) were then calculated for both the control and glucose addition treatments. Compared with those in the control, glucose addition significantly increased R-s and Q(10) in all forest soils. The increase in Q(10) (Delta Q(10)) between the control and glucose addition treatments differed significantly among the eight forest soils and was the highest in mid-latitude regions. Furthermore, Q(10) was significantly and negatively correlated with the soil C availability index (CAI), indicating that the Q(10) of soils with lower basal substrate availability (e.g., soils in mid-latitudes of eastern China) are enhanced more by labile C input than those of higher basal substrate availability. A significant negative relationship between Q(10) and substrate quality (SQI, measured as basal microbial respiration rate at 0 degrees C) without glucose addition supported the carbon quality temperature hypothesis; however, this hypothesis was not always valid after adding glucose. Our findings highlight the importance of basal substrate availability in influencing Q(10) after labile C addition, suggesting that C-climate models should incorporate different scenarios of labile C input in the future.
资助项目	Natural Science Foundation of China[31800368] ; Natural Science Foundation of China[31770655] ; Natural Science Foundation of China[31872690] ; Program of Youth Innovation Research Team Project[LENOM2016Q0005] ; UCAS Joint PhD Training Program
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000626605100020
资助机构	Natural Science Foundation of China ; Program of Youth Innovation Research Team Project ; UCAS Joint PhD Training Program
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161988]
专题	中国科学院地理科学与资源研究所
通讯作者	Xu, Li
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 3.Northeast Normal Univ, Inst Grassland Sci, Changchun 130024, Peoples R China 4.Minist Educ, Key Lab Vegetat Ecol, Changchun 130024, Peoples R China 5.Anhui Agr Univ, Resources & Environm Coll, Hefei 230036, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yuan,Xu, Li,Zheng, Shuai,et al. Temperature sensitivity of soil microbial respiration in soils with lower substrate availability is enhanced more by labile carbon input[J]. SOIL BIOLOGY & BIOCHEMISTRY,2021,154:9.
APA	Liu, Yuan.,Xu, Li.,Zheng, Shuai.,Chen, Zhi.,Cao, Yingqiu.,...&He, Nianpeng.(2021).Temperature sensitivity of soil microbial respiration in soils with lower substrate availability is enhanced more by labile carbon input.SOIL BIOLOGY & BIOCHEMISTRY,154,9.
MLA	Liu, Yuan,et al."Temperature sensitivity of soil microbial respiration in soils with lower substrate availability is enhanced more by labile carbon input".SOIL BIOLOGY & BIOCHEMISTRY 154(2021):9.